Brightness issues

3 réponses [Dernière contribution]
Daniel Molina
Hors ligne
A rejoint: 07/04/2009

It comes from here: https://trisquel.info/es/forum/plymouth-corruption

The point is that cannot be adjusted brightness without doing a trick: pulling out firstly the power wire.

The laptop used is this one (trisquel 5.0):

http://www.h-node.com/notebooks/view/en/30/SA50-110/2/1/TOSHIBA/undef/undef/undef/undef/undef/undef

I'm having also problems with other laptop (trisquel 4.5). The problem is a bit different: The information of the corner says that brightness is changing, but it is not happening really.

This is the computer:

http://www.h-node.com/notebooks/view/en/254/ASPIRE-5736Z-454G32Mnkk

At any case, the set of brightness is done with Fn-key.

lembas
Hors ligne
A rejoint: 05/13/2010

With some video cards it is possible to set brightness via a file named brightness below /sys in some subdirectory.

It contains a number 0-100.

malberts

I am a member!

I am a translator!

Hors ligne
A rejoint: 04/19/2011

Daniel, could you do some tests and report here?

Do

sudo showkey

to see what keypresses are being generated when you press Fn+Brightness.

Do that for the first laptop both before and after pulling out the power. In other words, both when the buttons are doing nothing and when they work.

I don't yet have an idea of where to look for the second laptop's problem.

Daniel Molina
Hors ligne
A rejoint: 07/04/2009

At any case, the result is always the same:

keycode 225 press
keycode 225 release

or

keycode 224 press
keycode 224 release

depending if your are lowing or increasing the brightness.